A369003 Numbers k for which k' / gcd(k,k') is odd, where k' stands for the arithmetic derivative of k, A003415.

2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 17, 18, 19, 22, 23, 24, 26, 27, 29, 30, 31, 32, 34, 36, 37, 38, 40, 41, 42, 43, 45, 46, 47, 48, 50, 53, 54, 56, 58, 59, 60, 61, 62, 63, 64, 66, 67, 70, 71, 72, 73, 74, 75, 78, 79, 80, 82, 83, 84, 86, 88, 89, 90, 94, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 109

Offset

1,1

Links

Table of n, a(n) for n=1..78.

Prog

(PARI) isA369003(n) = !A369001(n); \\ See the code in A369001.

Crossrefs

Positions of odd terms in A083345. Positions of 0's in A369001.

Cf. A003415, A369002 (complement), A369007 (subsequence).

Cf. also A368999.

Sequence in context: A058363 A049810 A132018 * A334142 A044919 A011871

Adjacent sequences: A369000 A369001 A369002 * A369004 A369005 A369006

Keyword

nonn

Author

Antti Karttunen, Jan 14 2024

Status

approved